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    Subject[PATCH V1 4/7] mmc: sdhci-msm: Update DDR_CONFIG as per device tree file
    Date
    Certain platforms require different settings in the
    SDCC_HC_REG_DDR_CONFIG register. This setting can change from platform
    to platform. So the driver should check whether a particular platform
    require a different setting by reading the device tree file and use it.

    Signed-off-by: Bao D. Nguyen <nguyenb@codeaurora.org>
    Signed-off-by: Sarthak Garg <sartgarg@codeaurora.org>
    ---
    drivers/mmc/host/sdhci-msm.c | 17 ++++++++++++++++-
    1 file changed, 16 insertions(+), 1 deletion(-)

    diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
    index 0f7baaf..b879806 100644
    --- a/drivers/mmc/host/sdhci-msm.c
    +++ b/drivers/mmc/host/sdhci-msm.c
    @@ -275,6 +275,7 @@ struct sdhci_msm_host {
    u32 transfer_mode;
    bool updated_ddr_cfg;
    bool uses_tassadar_dll;
    + u32 ddr_config;
    };

    static const struct sdhci_msm_offset *sdhci_priv_msm_offset(struct sdhci_host *host)
    @@ -987,7 +988,7 @@ static int sdhci_msm_cm_dll_sdc4_calibration(struct sdhci_host *host)
    ddr_cfg_offset = msm_offset->core_ddr_config;
    else
    ddr_cfg_offset = msm_offset->core_ddr_config_old;
    - writel_relaxed(DDR_CONFIG_POR_VAL, host->ioaddr + ddr_cfg_offset);
    + writel_relaxed(msm_host->ddr_config, host->ioaddr + ddr_cfg_offset);

    if (mmc->ios.enhanced_strobe) {
    config = readl_relaxed(host->ioaddr +
    @@ -1933,6 +1934,19 @@ static const struct sdhci_pltfm_data sdhci_msm_pdata = {
    .ops = &sdhci_msm_ops,
    };

    +static inline void sdhci_msm_get_of_property(struct platform_device *pdev,
    + struct sdhci_host *host)
    +{
    + struct device_node *node = pdev->dev.of_node;
    + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
    + struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
    +
    + if (of_property_read_u32(node, "qcom,ddr-config",
    + &msm_host->ddr_config))
    + msm_host->ddr_config = DDR_CONFIG_POR_VAL;
    +}
    +
    +
    static int sdhci_msm_probe(struct platform_device *pdev)
    {
    struct sdhci_host *host;
    @@ -1975,6 +1989,7 @@ static int sdhci_msm_probe(struct platform_device *pdev)
    msm_offset = msm_host->offset;

    sdhci_get_of_property(pdev);
    + sdhci_msm_get_of_property(pdev, host);

    msm_host->saved_tuning_phase = INVALID_TUNING_PHASE;

    --
    2.7.4
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